Yeah Beast, Superdrol, has a short life(hence the reason why you only want to run it at 3 weeks max)so the second week is the prime time! But during that one week you'll put on so much weight that you won't know if you are dreaming or not.
What helps me put on some weight is the raw protein bars. I make them with sugar free syrup and power butter and I take them with some monster V right before bed. I get my whey protein in, monster V(super slow release protein), and good fats with some major protein(do slow down the digestion even some more) all right before bed. Give it a shot and I promise you, you won't be disappointed